diff --git a/README.md b/README.md
index 5f39019..d04dc2b 100644
--- a/README.md
+++ b/README.md
@@ -19,5 +19,5 @@ $ fuse-overlayfs -o lowerdir=lowerdir/a:lowerdir/b,upperdir=up,workdir=workdir m
 Specify a different UID/GID mapping:
 
 ```
-$ fuse-overlayfs -o uid=0:10:100:100:10000:2000,gid=0:10:100:100:10000:2000,lowerdir=lowerdir/a:lowerdir/b,upperdir=up,workdir=workdir merged
+$ fuse-overlayfs -o uidmapping=0:10:100:100:10000:2000,gidmapping=0:10:100:100:10000:2000,lowerdir=lowerdir/a:lowerdir/b,upperdir=up,workdir=workdir merged
 ```
diff --git a/main.c b/main.c
index 371cb6a..81e8d50 100644
--- a/main.c
+++ b/main.c
@@ -134,9 +134,9 @@ static const struct fuse_opt cfs_opts[] = {
    offsetof (struct cfs_data, upperdir), 0},
   {"workdir=%s",
    offsetof (struct cfs_data, workdir), 0},
-  {"uid=%s",
+  {"uidmapping=%s",
    offsetof (struct cfs_data, uid_str), 0},
-  {"gid=%s",
+  {"gidmapping=%s",
    offsetof (struct cfs_data, gid_str), 0},
   FUSE_OPT_END
 };