diff --git a/inst/help/Power.md b/inst/help/Power.md
index bec8876..60bd81e 100644
--- a/inst/help/Power.md
+++ b/inst/help/Power.md
@@ -16,7 +16,7 @@ This module is based upon [jpower](https://github.com/richarddmorey/jpower/commi
   - Power: Calculate the power of detecting a particular effect, given a set sample size and effect size.
   - Effect size: Calculate the minimum effect size, that could be detected with a given power and sample size.
 - Minimal effect size of interest (δ): The minimal effect size using Cohen's d, that would be interesting to detect.
-- Minimum desired power (1-β): The minimum desired probability of detecting an effect (statistical power). β refers to the probability of conducting a Type I error (false negative), therefore power is defined as the opposite i.e. 1-β.
+- Minimum desired power (1-β): The minimum desired probability of detecting an effect (statistical power). β refers to the probability of conducting a Type II error (false negative), therefore power is defined as the opposite i.e. 1-β.
 - Sample size / Sample size per group (N): The given sample size.
 - Sample size ratio (N₁/N₂): Ratio between first and second groups sample size (independent samples t-test only).
 - Type I error rate (α): The Type I error rate (false positive) threshold which will be used when running tests later.