diff --git a/src/testdir/Make_amiga.mak b/src/testdir/Make_amiga.mak
index bc9638c..59c616d 100644
--- a/src/testdir/Make_amiga.mak
+++ b/src/testdir/Make_amiga.mak
@@ -1,5 +1,5 @@
 #
-# Makefile to run al tests for Vim, on Amiga
+# Makefile to run all tests for Vim, on Amiga
 #
 # Requires "rm", "csh" and "diff"!
 
diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index 6deca3d..00ceed2 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -1,5 +1,5 @@
 #
-# Makefile to run al tests for Vim, on Dos-like machines.
+# Makefile to run all tests for Vim, on Dos-like machines.
 #
 # Requires a set of Unix tools: echo, diff, etc.
 
diff --git a/src/testdir/Make_ming.mak b/src/testdir/Make_ming.mak
index 0024a4e..9029d98 100644
--- a/src/testdir/Make_ming.mak
+++ b/src/testdir/Make_ming.mak
@@ -1,4 +1,5 @@
-# Makefile to run tests for Vim, on Dos-like machines
+#
+# Makefile to run all tests for Vim, on Dos-like machines
 # with sh.exe or zsh.exe in the path or not.
 #
 # Author: Bill McCarthy
diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index ccbdb3e..f5262e2 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -1,5 +1,5 @@
 #
-# Makefile to run al tests for Vim, on OS/2
+# Makefile to run all tests for Vim, on OS/2
 #
 # Requires a set of Unix tools: echo, diff, etc.
 
diff --git a/src/testdir/main.aap b/src/testdir/main.aap
index 5fb93ec..78ef7e0 100644
--- a/src/testdir/main.aap
+++ b/src/testdir/main.aap
@@ -1,5 +1,5 @@
 #
-# Makefile to run al tests for Vim
+# Makefile to run all tests for Vim
 #
 
 VimProg ?= ../vim