diff --git a/common/arg.cpp b/common/arg.cpp
index 919e37b7f8..e7bb44f8f5 100644
--- a/common/arg.cpp
+++ b/common/arg.cpp
@@ -1569,12 +1569,10 @@ common_params_context common_params_parser_init(common_params & params, llama_ex
     ).set_sparam());
     add_opt(common_arg(
         {"--power-law-decay"}, "N",
-        string_format("power law sampler: decay rate for target adaptation over time. lower "
-                      "values -> faster but less stable adaptation. "
-                      "(valid range 0.0 to 1.0; ≤0 = no adaptation) (default: %.2f)",
-                      (double)params.sampling.power_law_decay),
-        [](common_params & params, int value) {
-            params.sampling.power_law_decay = value;
+        string_format("decay rate for target adaptation over time. lower values -> faster but less stable adaptation.\n"
+        "(valid range 0.0 to 1.0; ≤0 = no adaptation) (default: %.2f)", (double)params.sampling.power_law_decay),
+        [](common_params & params, const std::string & value) {
+            params.sampling.power_law_decay = std::stof(value);
         }
     ).set_sparam());
     add_opt(common_arg(
diff --git a/src/llama-sampling.cpp b/src/llama-sampling.cpp
index 26135a4f82..6beb927a6c 100644
--- a/src/llama-sampling.cpp
+++ b/src/llama-sampling.cpp
@@ -2427,8 +2427,11 @@ static void llama_sampler_power_law_apply(struct llama_sampler * smpl, llama_tok
 
     // update running history with the original probability of the selected token
     float original_p  = original_probs[idx];
+    fprintf(stderr, "power-law: original prob was %.3f\n", original_p); fflush(stderr);
     ctx->weighted_sum = original_p + decay * ctx->weighted_sum;
+    fprintf(stderr, "power-law: updated ctx->weighted_sum = %.3f\n", ctx->weighted_sum); fflush(stderr);
     ctx->total_weight = 1.0f + decay * ctx->total_weight;
+    fprintf(stderr, "power-law: updated ctx->total_weight = %.3f\n", ctx->total_weight); fflush(stderr);
 }
 
 static void llama_sampler_power_law_reset(struct llama_sampler * smpl) {