diff --git a/doc/quickstart_traceAnalyzer.md b/doc/quickstart_traceAnalyzer.md
index a72e17c32..a6c78ce61 100644
--- a/doc/quickstart_traceAnalyzer.md
+++ b/doc/quickstart_traceAnalyzer.md
@@ -54,10 +54,7 @@ The basic form is:
 | `--reuse` | Reuse time and reuse distance distribution, overall and over time | [reuse.py](/scripts/traceAnalysis/reuse.py), [reuse_heatmap.py](/scripts/traceAnalysis/reuse_heatmap.py) |
 | `--popularity` | Request count of each object, by rank | [popularity.py](/scripts/traceAnalysis/popularity.py) |
 | `--accessPattern` | A sample of which objects are accessed when | [access_pattern.py](/scripts/traceAnalysis/access_pattern.py) |
-| `--popularityDacay` | How an object's popularity fades with age | [popularity_decay.py](/scripts/traceAnalysis/popularity_decay.py) |
-
-> [!NOTE]
-> The popularity decay flag really is spelled `--popularityDacay`. That is a typo in the code. `--popularityDecay` is rejected as an unrecognized option.
+| `--popularityDecay` | How an object's popularity fades with age | [popularity_decay.py](/scripts/traceAnalysis/popularity_decay.py) |
 
 Run `./bin/traceAnalyzer --help` for the full list of tasks and options.
 
@@ -250,7 +247,7 @@ Pass these two scripts the base name, without the `_req`/`_obj` or `_rt`/`_vt` s
 This shows how likely an object is to be requested again as it gets older. You need a long trace, around a week, for a useful plot. Most block workloads do not have enough requests.
 
 ```bash
-./bin/traceAnalyzer <trace_path> <trace_type> --popularityDacay
+./bin/traceAnalyzer <trace_path> <trace_type> --popularityDecay
 python3 ../scripts/traceAnalysis/popularity_decay.py ${dataname}.popularityDecay_w300_obj
 ```
 
diff --git a/libCacheSim/bin/traceAnalyzer/cli_parser.cpp b/libCacheSim/bin/traceAnalyzer/cli_parser.cpp
index 7251abc92..693ecbaa4 100644
--- a/libCacheSim/bin/traceAnalyzer/cli_parser.cpp
+++ b/libCacheSim/bin/traceAnalyzer/cli_parser.cpp
@@ -74,7 +74,7 @@ static struct argp_option options[] = {
      "enable popularity analysis, output freq:cnt in dataname.popularity file, "
      "and prints the skewness to stdout and stat file",
      3},
-    {"popularityDacay", OPTION_ENABLE_POPULARITY_DECAY, NULL,
+    {"popularityDecay", OPTION_ENABLE_POPULARITY_DECAY, NULL,
      OPTION_ARG_OPTIONAL,
      "enable popularity decay analysis, this calculates popularity fade as a "
      "heatmap. It is an expensive analysis, enable only when needed.",
diff --git a/test/test_cli.sh b/test/test_cli.sh
index e938c0ef6..8ff5d712d 100755
--- a/test/test_cli.sh
+++ b/test/test_cli.sh
@@ -542,6 +542,24 @@ if [[ -x "${BIN_DIR}/traceAnalyzer" ]]; then
 		"${BIN_DIR}/traceAnalyzer" --common -o out-common "${TRACE}" vscsi
 	expect_ok "traceAnalyzer --num-req" \
 		"${BIN_DIR}/traceAnalyzer" --num-req=10000 -o out-nreq "${TRACE}" vscsi
+
+	# The option was registered as --popularityDacay, so the documented
+	# --popularityDecay was rejected as unrecognized. The correct spelling must
+	# run the analysis and write its data file. It writes into its own
+	# directory so the output file check cannot be satisfied by another run.
+	_trace_name=$(basename "${TRACE}")
+	mkdir -p pd-out
+	expect_ok "traceAnalyzer --popularityDecay" \
+		"${BIN_DIR}/traceAnalyzer" "${TRACE}" vscsi --popularityDecay \
+		-o "pd-out/${_trace_name}"
+	if [[ -s "pd-out/${_trace_name}.popularityDecay_w300_obj" ]]; then
+		_report 0 ""
+	else
+		_report 1 "traceAnalyzer --popularityDecay did not write ${_trace_name}.popularityDecay_w300_obj"
+	fi
+	# [-] keeps grep from reading a pattern that starts with -- as an option
+	expect_output "traceAnalyzer --help lists --popularityDecay" \
+		"[-]-popularityDecay" "${BIN_DIR}/traceAnalyzer" --help
 fi
 
 if [[ -x "${BIN_DIR}/mrcProfiler" ]]; then