diff --git a/Skip.env b/Skip.env
index 1a2980d..4f2665e 100644
--- a/Skip.env
+++ b/Skip.env
@@ -14,7 +14,7 @@ PRODUCT_BUNDLE_IDENTIFIER = xyz.tyiu.SatsPrice
 MARKETING_VERSION = 0.2.0
 
 // The build number specifying the internal app version
-CURRENT_PROJECT_VERSION = 2
+CURRENT_PROJECT_VERSION = 3
 
 // The package name for the Android entry point, referenced by the AndroidManifest.xml
 ANDROID_PACKAGE_NAME = sats.price
diff --git a/Sources/SatsPrice/ContentView.swift b/Sources/SatsPrice/ContentView.swift
index 755feae..9f4a798 100644
--- a/Sources/SatsPrice/ContentView.swift
+++ b/Sources/SatsPrice/ContentView.swift
@@ -88,6 +88,10 @@ public struct ContentView: View {
 #endif
             } header: {
                 Text("Sats")
+            } footer: {
+                if satsViewModel.exceedsMaximum {
+                    Text("2100000000000000 sats is the maximum.")
+                }
             }
 
             Section {
@@ -97,6 +101,10 @@ public struct ContentView: View {
 #endif
             } header: {
                 Text("BTC")
+            } footer: {
+                if satsViewModel.exceedsMaximum {
+                    Text("21000000 BTC is the maximum.")
+                }
             }
 
             Section {
diff --git a/Sources/SatsPrice/Resources/Localizable.xcstrings b/Sources/SatsPrice/Resources/Localizable.xcstrings
index 54f5947..3e62340 100644
--- a/Sources/SatsPrice/Resources/Localizable.xcstrings
+++ b/Sources/SatsPrice/Resources/Localizable.xcstrings
@@ -16,6 +16,12 @@
     },
     "1 BTC to %@" : {
 
+    },
+    "21000000 BTC is the maximum." : {
+
+    },
+    "2100000000000000 sats is the maximum." : {
+
     },
     "BTC" : {
 
diff --git a/Sources/SatsPrice/SatsViewModel.swift b/Sources/SatsPrice/SatsViewModel.swift
index 1be80a8..e3b10fa 100644
--- a/Sources/SatsPrice/SatsViewModel.swift
+++ b/Sources/SatsPrice/SatsViewModel.swift
@@ -190,6 +190,13 @@ class SatsViewModel: ObservableObject {
         }
 #endif
     }
+
+    var exceedsMaximum: Bool {
+        if let btc, btc > Decimal(21000000) {
+            return true
+        }
+        return false
+    }
 }
 
 extension Decimal {