diff --git a/ChangeLog b/ChangeLog
index a3d7e59..e5d8d35 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -52,6 +52,9 @@ be the first character of a match.
 overflow if the heap limit was set very large. This could cause incorrect "heap 
 limit exceeded" errors. 
 
+13. Add "kibibytes" to the heap limit output from pcre2test -C to make the 
+units clear.
+
 
 Version 10.32 10-September-2018
 -------------------------------
diff --git a/src/pcre2test.c b/src/pcre2test.c
index 6af25cb..1944e32 100644
--- a/src/pcre2test.c
+++ b/src/pcre2test.c
@@ -8152,7 +8152,7 @@ printf("  Internal link size = %d\n", optval);
 (void)PCRE2_CONFIG(PCRE2_CONFIG_PARENSLIMIT, &optval);
 printf("  Parentheses nest limit = %d\n", optval);
 (void)PCRE2_CONFIG(PCRE2_CONFIG_HEAPLIMIT, &optval);
-printf("  Default heap limit = %d\n", optval);
+printf("  Default heap limit = %d kibibytes\n", optval);
 (void)PCRE2_CONFIG(PCRE2_CONFIG_MATCHLIMIT, &optval);
 printf("  Default match limit = %d\n", optval);
 (void)PCRE2_CONFIG(PCRE2_CONFIG_DEPTHLIMIT, &optval);