diff --git a/HACKING.rst b/HACKING.rst
index d763c75b8b..b76cb6c4a7 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -219,7 +219,7 @@ These scripts are executed serially by ``exercise.sh`` in testing situations.
     set -o errexit
 
     # Print the commands being run so that we can see the command that triggers
-    # an error.  It is also useful for following allowing as the install occurs.
+    # an error.  It is also useful for following as the install occurs.
     set -o xtrace
 
 * Settings and configuration are stored in ``exerciserc``, which must be
diff --git a/exercises/aggregates.sh b/exercises/aggregates.sh
index 808ef76e2f..8cbca54fb2 100755
--- a/exercises/aggregates.sh
+++ b/exercises/aggregates.sh
@@ -20,7 +20,7 @@ echo "**************************************************"
 set -o errexit
 
 # Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following allowing as the install occurs.
+# an error.  It is also useful for following as the install occurs.
 set -o xtrace
 
 
diff --git a/exercises/boot_from_volume.sh b/exercises/boot_from_volume.sh
index 84ac08f017..7478bdf138 100755
--- a/exercises/boot_from_volume.sh
+++ b/exercises/boot_from_volume.sh
@@ -16,7 +16,7 @@ echo "*********************************************************************"
 set -o errexit
 
 # Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following allowing as the install occurs.
+# an error.  It is also useful for following as the install occurs.
 set -o xtrace
 
 
diff --git a/exercises/client-args.sh b/exercises/client-args.sh
index 2c8fe81390..b380968da8 100755
--- a/exercises/client-args.sh
+++ b/exercises/client-args.sh
@@ -13,7 +13,7 @@ echo "*********************************************************************"
 set -o errexit
 
 # Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following allowing as the install occurs.
+# an error.  It is also useful for following as the install occurs.
 set -o xtrace
 
 
diff --git a/exercises/client-env.sh b/exercises/client-env.sh
index 6ab4d08715..fff04df9f2 100755
--- a/exercises/client-env.sh
+++ b/exercises/client-env.sh
@@ -13,7 +13,7 @@ echo "*********************************************************************"
 set -o errexit
 
 # Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following allowing as the install occurs.
+# an error.  It is also useful for following as the install occurs.
 set -o xtrace
 
 
diff --git a/exercises/floating_ips.sh b/exercises/floating_ips.sh
index 485208ba30..5abc7137b3 100755
--- a/exercises/floating_ips.sh
+++ b/exercises/floating_ips.sh
@@ -13,7 +13,7 @@ echo "*********************************************************************"
 set -o errexit
 
 # Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following allowing as the install occurs.
+# an error.  It is also useful for following as the install occurs.
 set -o xtrace
 
 
diff --git a/exercises/neutron-adv-test.sh b/exercises/neutron-adv-test.sh
index 81150061ca..dc6bbbb5c7 100755
--- a/exercises/neutron-adv-test.sh
+++ b/exercises/neutron-adv-test.sh
@@ -20,7 +20,7 @@ echo "*********************************************************************"
 set -o errtrace
 
 # Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following allowing as the install occurs.
+# an error.  It is also useful for following as the install occurs.
 set -o xtrace
 
 # Environment
diff --git a/exercises/sec_groups.sh b/exercises/sec_groups.sh
index 5f8b0a4d5d..2f78e393eb 100755
--- a/exercises/sec_groups.sh
+++ b/exercises/sec_groups.sh
@@ -13,7 +13,7 @@ echo "*********************************************************************"
 set -o errexit
 
 # Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following allowing as the install occurs.
+# an error.  It is also useful for following as the install occurs.
 set -o xtrace
 
 
diff --git a/exercises/swift.sh b/exercises/swift.sh
index 4a41e0f1ed..8aa376b8a7 100755
--- a/exercises/swift.sh
+++ b/exercises/swift.sh
@@ -13,7 +13,7 @@ echo "*********************************************************************"
 set -o errexit
 
 # Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following allowing as the install occurs.
+# an error.  It is also useful for following as the install occurs.
 set -o xtrace
 
 
diff --git a/exercises/volumes.sh b/exercises/volumes.sh
index 0de1226fee..e7c3560894 100755
--- a/exercises/volumes.sh
+++ b/exercises/volumes.sh
@@ -13,7 +13,7 @@ echo "*********************************************************************"
 set -o errexit
 
 # Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following allowing as the install occurs.
+# an error.  It is also useful for following as the install occurs.
 set -o xtrace