diff --git a/lib/pam_putenv.c b/lib/pam_putenv.c
index e3c2485..ecca3b1 100644
--- a/lib/pam_putenv.c
+++ b/lib/pam_putenv.c
@@ -102,7 +102,7 @@ pam_putenv(pam_handle_t *pamh,
  */
 
 /**
- * The =pam_putenv function sets a environment variable.
+ * The =pam_putenv function sets an environment variable.
  * Its semantics are similar to those of =putenv, but it modifies the PAM
  * context's environment list instead of the application's.
  *
diff --git a/lib/pam_setenv.c b/lib/pam_setenv.c
index bcc55d1..c5d4fe0 100644
--- a/lib/pam_setenv.c
+++ b/lib/pam_setenv.c
@@ -92,7 +92,7 @@ pam_setenv(pam_handle_t *pamh,
  */
 
 /**
- * The =pam_setenv function sets a environment variable.
+ * The =pam_setenv function sets an environment variable.
  * Its semantics are similar to those of =setenv, but it modifies the PAM
  * context's environment list instead of the application's.
  *